CONTENTS

  Title Page

  Copyright Page

  Preface

  1      Introduction to VAX Volume Shadowing

  1.1    Overview

  1.2    Volume Shadowing Terms

  1.3    Hardware Requirements

  1.4    Mounting a Shadow Set

  1.5    Shadow Set Changes

  1.6    Examining a Shadow Set

  1.7    Adding and Removing Shadow Set Members

  1.8    Dissolving a Shadow Set

  1.9    Shadow Sets as System Disks and in VAXclusters

  2      The Command-Level Interface

  2.1    Creating a Shadow Set with the Mount Utility
    2.1.1      Mounting a Files-11 Shadow Set
    2.1.2      MOUNT Examples
    2.1.3      Mounting a Foreign Shadow Set
    2.1.4      Files-11 Copy Operations
      2.1.4.1      Full Copy
      2.1.4.2      Merge Copy
      2.1.4.3      Determining the Correct Copy Operation
    2.1.5      Qualifiers
      2.1.5.1      The /CONFIRM Qualifier (Files-11 Shadow Sets)
      2.1.5.2      The /COPY Qualifier (Files-11 Shadow Sets)
      2.1.5.3      The /OVERRIDE=SHADOW_MEMBERSHIP Qualifier
      2.1.5.4      Using MOUNT/OVERRIDE=IDENTIFICATION
      2.1.5.5      Using MOUNT/NOMOUNT_VERIFICATION

  2.2    Adding Members to a Shadow Set

  2.3    Removing Members from a Shadow Set

  2.4    Dismounting and Dissolving a Shadow Set

  2.5    Examining a Shadow Set with the DCL Command SHOW DEVICES
    2.5.1      Listing Shadow Set Virtual Units
    2.5.2      Listing Shadow Set Members
    2.5.3      SHOW DEVICES Examples

  2.6    Using the F$GETDVI Lexical Function

  2.7    Performing Backup Operations on a Shadow Set
    2.7.1      Using a Shadow Set Copy as a Backup
    2.7.2      Using the VMS Backup Utility
    2.7.3      Using BACKUP/IMAGE on a Shadow Set

  2.8    Maintaining a Shadow Set

  3      Performing Shadow Set Operations with System Services

  3.1    Using $MOUNT to Create and Mount Shadow Sets
    3.1.1      $MOUNT Shadow Set Item Codes
    3.1.2      Constructing the $MOUNT Item List
    3.1.3      Examples of $MOUNT Item Lists
    3.1.4      Evaluating Condition Values Returned by $DISMOU, $MOUNT, and $QIO

  3.2    Using $DISMOU to Dismount Shadow Sets
    3.2.1      Removing Member Units from Shadow Sets
    3.2.2      Dismounting and Dissolving Shadow Sets
    3.2.3      Setting $DISMOU Flags in Shadow Set Operations

  3.3    Using $GETDVI to Obtain Information About Shadow Sets
    3.3.1      $GETDVI Shadow Set Item Codes
    3.3.2      Obtaining the Names of All Members of a Shadow Set

  4      Licensing, Enabling, and Managing VAX Volume Shadowing

  4.1    Registering the Volume Shadowing Product Authorization Key (PAK)

  4.2    Setting the SYSGEN Parameter for Volume Shadowing

  4.3    Using Volume Shadowing on the System Disk

  4.4    Booting from a System Disk Shadow Set

  4.5    Upgrading a System That Uses a System Disk Shadow Set

  4.6    Performance Information for Volume Shadowing

  4.7    Standalone BACKUP and Volume Shadowing
    4.7.1      Incompatiblities Between Shadow Sets and Standalone BACKUP
    4.7.2      Using Standalone BACKUP on Disks That Are Former Shadow Set Members

  4.8    Volume Shadowing in Mixed-Interconnect Clusters
    4.8.1      Mounting Shadow Sets in a Mixed-Interconnect VAXcluster Configuration
    4.8.2      Dismounting Shadow Sets in a Mixed-Interconnect VAXcluster Configuration
    4.8.3      Using Shadow Sets as Satellite System Disks

  A   Messages

  A.1    Mount Verification Status Messages

  A.2    Mount Verification Messages That Apply to Shadow Sets

  A.3    MOUNT Messages That Apply to Shadow Sets

  B   MOUNT Qualifiers for Volume Shadowing

  /CONFIRM

  /COPY

  /OVERRIDE

  /SHADOW

  C   System Services Item Codes for Volume Shadowing

  EXAMPLES

  4-1        Example of a Product Authorization Key (PAK)

  4-2        Shadow Set as Seen from Boot Server

  4-3        Shadow Set as Seen from Satellite

  FIGURES

  1-1        Elements of a Shadow Set (One VAX - One HSC)

  1-2        Elements of a Shadow Set (One VAX - Two HSCs)

  1-3        Elements of a Shadow Set (A VAXcluster - Two HSCs)

  4-1        Booting from a System Disk Shadow Set

  TABLES

  2-1        F$GETDVI Items for Volume Shadowing

  4-1        Names of Default Boot Command Procedures